code: def test_dynamic_subpackage_import():
      # Test that subpackages are dynamically imported and properly cached.
  
      # ray.data
      assert "ray.data" not in sys.modules
      ray.data
      # Check that the package is cached.
      assert "ray.data" in sys.modules
  
      # ray.workflow
      assert "ray.workflow" not in sys.modules
      ray.workflow
      # Check that the package is cached.
      assert "ray.workflow" in sys.modules
  
      # ray.data
      assert "ray.autoscaler" not in sys.modules
      ray.autoscaler
      # Check that the package is cached.
      assert "ray.autoscaler" in sys.modules
  
file_path: ray/python/ray/tests/test_top_level_api.py
imports: from inspect import getmembers, isfunction, ismodule
  import sys
  import pytest
  import ray
label_desc: Use image node_id 3 for calling a global function with example usage: test_dynamic_subpackage_import() without return types